We don't need linker sets listed as sections. They are explicitly
included in the objcopy we use to create the .efi file. This practice
was added in 2002 by peter@ in a6d81d83a280 to make ia64 builds
self-hosted. However, it was added back to the objcopy in 2010 by rpaulo
in 8df7a05edd36 for i386 EFI support, though the ldscript file then
retained them needlessly. The gcc/binutils bug having been fixed in the
interim. We've not needed them since then, but the redundancy didn't
matater.

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